Abstract
I give a review on the generation-changing interactions of the supersymmetric standard model based on grand unification and N = 1 supergravity. These interactions could make sizable effects on rare processes related to B-mesons. The decay b → sγ is discussed in particular. It is shown that the inclusive branching ratio of the radiative B-meson decay is deviated from the standard model prediction in nontrivial ranges for parameter values.
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